The Qwt library contains Qt GUI Components and utility classes which
are primarily useful for programs with a technical background. Most of
these widgets are used to control or display values, arrays, or ranges
of type double.

/usr/share/doc/libqwt-dev/README

The Qwt Widget Library
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Qwt is an extension to the Qt GUI library from Troll Tech AS.
The Qwt library contains widgets and components which are
primarily useful for technical and scientifical purposes.
It includes a 2-D plotting widget, different kinds of sliders,
and much more.
Qwt is hosted at http://qwt.sf.net
Installation
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